Here’s a first draft.
https://github.com/FroggyFlox/rockon-registry/blob/Add_Koel/koel.json
It loads OK on my system but I can’t test the install for now so I’ll you try it out.
As a reminder, @phillxnet wrote a very nice “How-to” try and test Rock-on for verification here:
How to test a Rock-on pull request - #2 by azteech
Enjoy!